CVE-2020-3390 : What You Need to Know

A vulnerability in Simple Network Management Protocol (SNMP) trap generation for wireless clients of the Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9000 Family could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition by causing the device to unexpectedly reload.

Understanding CVE-2020-3390

This CVE involves a vulnerability in SNMP trap generation for wireless clients of Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family.

What is CVE-2020-3390?

The vulnerability allows an adjacent attacker to trigger a DoS condition by exploiting the lack of input validation in generating SNMP traps related to wireless client connections.

The Impact of CVE-2020-3390

Severity: High (CVSS Base Score: 7.4)
Attack Vector: Adjacent Network
Availability Impact: High

Technical Details of CVE-2020-3390

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from insufficient input validation in SNMP trap generation for wireless clients, enabling attackers to cause device reloads and DoS conditions.

Affected Systems and Versions

Affected Product: Cisco IOS XE Software
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

Attackers can exploit the vulnerability by sending crafted 802.1x packets during wireless authentication setup, leading to device reloads and DoS.

Mitigation and Prevention

Protect your systems from CVE-2020-3390 with the following measures:

Immediate Steps to Take

Implement network segmentation to limit adjacent network access.
Apply the latest security patches and updates from Cisco.

Long-Term Security Practices

Regularly monitor network traffic for unusual patterns.
Conduct security training for staff to recognize and report suspicious activities.

Patching and Updates

Stay informed about security advisories from Cisco.
Apply recommended patches promptly to mitigate the vulnerability.